package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.lang.UUID;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RegexUtils;
import com.hmdp.utils.SendSmsUtil;
import com.hmdp.utils.UserHolder;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.connection.BitFieldSubCommands;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import javax.servlet.http.HttpSession;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.*;
import static com.hmdp.utils.SystemConstants.USER_NICK_NAME_PREFIX;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Slf4j
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {
    @Resource
    private StringRedisTemplate stringRedisTemplate;

    @Autowired
    private SendSmsUtil sendSmsUtil;

    @Override
    public Result sendCode(String phone, HttpSession session) {
        //1.校验手机号
        if (RegexUtils.isPhoneInvalid(phone)) {
            return Result.fail("手机号格式错误");
        }
        String code = RandomUtil.randomNumbers(6);

/*
        //向手机发送短信验证码，打开注释实现该功能
        try {
            sendSmsUtil.sendSMS(Integer.parseInt(code), phone, session, "b52e893a8a834b71ad31b1eb2cbcaa18", null);
        } catch (Exception e) {
            e.printStackTrace();
            return Result.fail("手机验证码验证失败");
        }
*/

        //将验证码存入redis
        //set key value ex
        stringRedisTemplate.opsForValue().set(LOGIN_CODE_KEY + phone, code, LOGIN_CODE_TTL, TimeUnit.MINUTES);
        log.debug("发送短信验证码成功，验证码{}", code);

        return Result.ok();
    }

    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {
        String phone = loginForm.getPhone();
        if (RegexUtils.isPhoneInvalid(phone)) {
            return Result.fail("手机号格式错误");
        }
        String redisCode = stringRedisTemplate.opsForValue().get(LOGIN_CODE_KEY + phone);
        String code = loginForm.getCode();
        if (redisCode == null || !redisCode.equals(code)) {
            return Result.fail("验证码错误");
        }
        User user = query().eq("phone", phone).one();
        if (user == null) {
            user = createUserWithPhone(phone);
        }
        //isSimple，简单模式，不带下划线
        String token = UUID.randomUUID().toString(true);
        //将查到的user对象拷贝为userDTO对象，实现敏感信息过滤
        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);
        //将userDTO中得字段全部转为string，否则会抛出类型转换异常  private Long id;//Long类型
        //将userDTO转存为userMap过程中，要确保所有的键值对都是String类型
        //自定义选项setFieldValueEditor字段值修改器
        Map<String, Object> userMap = BeanUtil.beanToMap(userDTO, new HashMap<>(),
                CopyOptions.create()
                        .setIgnoreNullValue(true)
                        .setFieldValueEditor((fieldName, fieldValue) -> fieldValue.toString())
        );

        stringRedisTemplate.opsForHash().putAll(LOGIN_USER_KEY + token, userMap);
        //设置token的有效期，生产环境是30分钟redis里面TTL是1800单位秒，测试环境是30小时
//        stringRedisTemplate.expire(LOGIN_USER_KEY + token, LOGIN_USER_TTL, TimeUnit.MINUTES); //生产
        stringRedisTemplate.expire(LOGIN_USER_KEY + token, LOGIN_USER_TTL, TimeUnit.HOURS); //测试


        return Result.ok(token);
    }

    @Override   //签到功能（现在仅限今天签到功能）
    public Result sign() {
        //获取当前登录用户
        Long userId = UserHolder.getUser().getId();
        //获取日期
        LocalDateTime now = LocalDateTime.now();
        //拼接key
        String keySuffix = now.format(DateTimeFormatter.ofPattern(":yyyyMM"));
        String key = USER_SIGN_KEY + userId + keySuffix;
        //获取今天是本月的第几天
        int dayOfMonth = now.getDayOfMonth();//(from = 1, to = 31)
        //写入redis SETBIT KEY offset 1

        stringRedisTemplate.opsForValue().setBit(key, dayOfMonth - 1, true);
        return Result.ok();
    }

    @Override  //统计当前登录用户当前月当天之前连续签到次数SETBIT sign:5:202204 3 1 (第四天手动签到)
    public Result signCount() {
        //获取当前登录用户
        Long userId = UserHolder.getUser().getId();
        //获取日期
        LocalDateTime now = LocalDateTime.now();
        //拼接key
        String keySuffix = now.format(DateTimeFormatter.ofPattern(":yyyyMM"));
        String key = USER_SIGN_KEY + userId + keySuffix;
        //获取今天是本月的第几天
        int dayOfMonth = now.getDayOfMonth();//(from = 1, to = 31)
        //获取本月截止今天的所有的签到记录,返回的是一个十进制的数字bitfield sign:202204 get u6 0
        List<Long> result = stringRedisTemplate.opsForValue().bitField(
                key,
                BitFieldSubCommands.create()
                        .get(BitFieldSubCommands.BitFieldType.unsigned(dayOfMonth))
                        .valueAt(0)
        );
        if (result == null || result.isEmpty()) {
            return Result.ok(0);
        }
        Long num = result.get(0);
        if (num == null || num == 0) {
            return Result.ok(0);
        }
        //循环遍历，让这个数字与1做与运算，得到最后一个bit,判断这个bit是否为0，
        int count = 0;
        while (true) {
            if ((num & 1) == 0) {
                //如果为0，就是未签到，结束
                break;
            } else {
                //如果不为0，说明已签到，计数器+1，
                count++;
            }
            //把数字右移一位，抛弃最后一个bit位，继续下一个bit位比较,（先右移一位，再赋值给num）
            num >>>= 1;
        }
        return Result.ok(count);
    }

    private User createUserWithPhone(String phone) {
        User user = new User();
        user.setPhone(phone);
        user.setNickName(USER_NICK_NAME_PREFIX + RandomUtil.randomString(10));
        save(user);
        return user;
    }
}
